diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 48628be59bfaee14c72887fc34e468494e1cffe5..7bf2dd6282198e4ebdfa07e4a3e77dc8b8616676 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,10 +18,8 @@ test:centos7.3:
     - yum -y -q -e 0 install make
     - yum -y -q -e 0 install libicu
     - yum -y -q -e 0 install libjpeg-turbo
-    - yum -y -q -e 0 install mesa-libGL-devel
-    - yum -y -q -e 0 install mesa-libGLU-devel
     - yum -y -q -e 0 install freetype
-    - yum -y -q -e 0 install libpng
+    - yum -y -q -e 0 install openssl
     - mkdir -p /scicore/soft/modules
     - ln -s /export/soft/apps/centos7/generic /scicore/soft/apps
     - ln -s /export/soft/modules/centos7/generic/all /scicore/soft/modules
@@ -33,7 +31,9 @@ test:centos7.3:
     - module load Eigen/3.3.1
     - module load Boost/1.68.0-foss-2018b-Python-3.6.6
     - module load LibTIFF/.4.0.9-GCCcore-7.3.0
+    - module load libpng/.1.6.34-GCCcore-7.3.0
     - module load HH-suite/2.0.16-foss-2018b
+    - module load Perl/5.28.0-GCCcore-7.3.0
     - module load OpenMM/7.1.1-foss-2018b-Python-3.6.6
     - module load SQLite/3.24.0-GCCcore-7.3.0
     - module load dssp/2.2.1-foss-2018b-Boost-1.68.0-Python-3.6.6 
@@ -63,7 +63,7 @@ test:centos7.3:
              -DSQLITE3_INCLUDE_DIR=$EBROOTSQLITE/include
              -DBOOST_ROOT=$EBROOTBOOST
              -DPNG_LIBRARY=$EBROOTLIBPNG/lib/libpng.so
-             -DPNG_INCLUDE_DIR=$EBROOTLIBPNG/include
+             -DPNG_PNG_INCLUDE_DIR=$EBROOTLIBPNG/include
              -DZLIB_LIBRARY=$EBROOTZLIB/lib/libz.so
              -DZLIB_INCLUDE_DIR=$EBROOTZLIB/include
              -DTIFF_INCLUDE_DIR=$EBROOTLIBTIFF/include